Was just wondering about the manabase. Is it better to run Misty or Marsh Flats/Black fetch.

The black fetch can grab the all important basic swamp while Misty can grab a Trop. Thoughts? Being able to get the swamp consistently let's you cast abrupt decay with a swamp and a Deathrite. Fetch, Swamp into Deathrite means you can cast Decay in case you get bloodmooned.